In a large mixing bowl, beat the room temperature cream cheese using a hand mixer or whisk until it is smooth and creamy.
Once the cream cheese is smooth, gradually add in the granulated sugar and continue to mix until well combined.
Pour in the pure vanilla extract and the sour cream. Mix until everything is fully combined and creamy.
Gently fold in the washed and dried red and green grapes into the creamy mixture.
Sprinkle the light brown sugar over the salad and fold it in carefully.
If you’re using pecans, lightly toast them in a dry skillet over medium heat for about 3-5 minutes until fragrant. Allow them to cool, then add them to the grape salad.
Transfer the Creamy Grape Salad to a serving dish and refrigerate for at least an hour before serving.